blob: da5131de31d9a98cfecaffdcf65209974e48d5e9 [file] [log] [blame]
Damien Millerbe43ebf2006-07-24 13:51:51 +10001/* $OpenBSD: canohost.c,v 1.57 2006/07/12 22:28:51 stevesk Exp $ */
Damien Millerd4a8b7e1999-10-27 13:42:43 +10002/*
Damien Miller95def091999-11-25 00:26:21 +11003 * Author: Tatu Ylonen <ylo@cs.hut.fi>
Damien Miller95def091999-11-25 00:26:21 +11004 * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
5 * All rights reserved
Damien Miller95def091999-11-25 00:26:21 +11006 * Functions for returning the canonical host name of the remote site.
Damien Miller4af51302000-04-16 11:18:38 +10007 *
Damien Millere4340be2000-09-16 13:29:08 +11008 * As far as I am concerned, the code I have written for this software
9 * can be used freely for any purpose. Any derived versions of this
10 * software must be clearly marked as such, and if the derived work is
11 * incompatible with the protocol description in the RFC file, it must be
12 * called by a name other than "ssh" or "Secure Shell".
Damien Miller95def091999-11-25 00:26:21 +110013 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +100014
15#include "includes.h"
Damien Millerc7b06362006-03-15 11:53:45 +110016
Damien Millere3b60b52006-07-10 21:08:03 +100017#include <sys/types.h>
Damien Miller8ec8c3e2006-07-10 20:35:38 +100018#include <sys/socket.h>
19
20#include <netinet/in.h>
21
Damien Millerc7b06362006-03-15 11:53:45 +110022#include <ctype.h>
Darren Tucker39972492006-07-12 22:22:46 +100023#include <errno.h>
Damien Millerbe43ebf2006-07-24 13:51:51 +100024#if defined(HAVE_NETDB_H)
25# include <netdb.h>
26#endif
Damien Millerd4a8b7e1999-10-27 13:42:43 +100027
28#include "packet.h"
29#include "xmalloc.h"
Ben Lindstrom226cfa02001-01-22 05:34:40 +000030#include "log.h"
Ben Lindstrom31ca54a2001-02-09 02:11:24 +000031#include "canohost.h"
Damien Millerd4a8b7e1999-10-27 13:42:43 +100032
Ben Lindstrombba81212001-06-25 05:01:22 +000033static void check_ip_options(int, char *);
Damien Miller33804262001-02-04 23:20:18 +110034
Damien Miller5428f641999-11-25 11:54:57 +110035/*
36 * Return the canonical name of the host at the other end of the socket. The
37 * caller should free the returned string with xfree.
38 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +100039
Ben Lindstrombba81212001-06-25 05:01:22 +000040static char *
Darren Tucker3f9fdc72004-06-22 12:56:01 +100041get_remote_hostname(int sock, int use_dns)
Damien Millerd4a8b7e1999-10-27 13:42:43 +100042{
Damien Miller34132e52000-01-14 15:45:46 +110043 struct sockaddr_storage from;
44 int i;
45 socklen_t fromlen;
46 struct addrinfo hints, *ai, *aitop;
Damien Miller33804262001-02-04 23:20:18 +110047 char name[NI_MAXHOST], ntop[NI_MAXHOST], ntop2[NI_MAXHOST];
Damien Millerd4a8b7e1999-10-27 13:42:43 +100048
Damien Miller95def091999-11-25 00:26:21 +110049 /* Get IP address of client. */
50 fromlen = sizeof(from);
51 memset(&from, 0, sizeof(from));
Darren Tucker3f9fdc72004-06-22 12:56:01 +100052 if (getpeername(sock, (struct sockaddr *)&from, &fromlen) < 0) {
Damien Miller95def091999-11-25 00:26:21 +110053 debug("getpeername failed: %.100s", strerror(errno));
Darren Tucker3e33cec2003-10-02 16:12:36 +100054 cleanup_exit(255);
Damien Millerd4a8b7e1999-10-27 13:42:43 +100055 }
Damien Miller7bcb0892000-03-11 20:45:40 +110056
Damien Miller2eaf37d2006-04-18 15:13:16 +100057 if (from.ss_family == AF_INET)
58 check_ip_options(sock, ntop);
59
Damien Miller927f5272003-11-24 12:57:25 +110060 ipv64_normalise_mapped(&from, &fromlen);
Damien Miller7bcb0892000-03-11 20:45:40 +110061
Damien Miller5e4471e2003-01-07 10:51:23 +110062 if (from.ss_family == AF_INET6)
63 fromlen = sizeof(struct sockaddr_in6);
Damien Miller7bcb0892000-03-11 20:45:40 +110064
Damien Miller34132e52000-01-14 15:45:46 +110065 if (getnameinfo((struct sockaddr *)&from, fromlen, ntop, sizeof(ntop),
Damien Miller9f0f5c62001-12-21 14:45:46 +110066 NULL, 0, NI_NUMERICHOST) != 0)
Damien Miller34132e52000-01-14 15:45:46 +110067 fatal("get_remote_hostname: getnameinfo NI_NUMERICHOST failed");
Damien Miller95def091999-11-25 00:26:21 +110068
Damien Miller3a961dc2003-06-03 10:25:48 +100069 if (!use_dns)
70 return xstrdup(ntop);
71
Ben Lindstrom121c7852001-04-18 15:32:44 +000072 debug3("Trying to reverse map address %.100s.", ntop);
Damien Miller34132e52000-01-14 15:45:46 +110073 /* Map the IP address to a host name. */
74 if (getnameinfo((struct sockaddr *)&from, fromlen, name, sizeof(name),
Damien Miller9f0f5c62001-12-21 14:45:46 +110075 NULL, 0, NI_NAMEREQD) != 0) {
Damien Miller33804262001-02-04 23:20:18 +110076 /* Host name not found. Use ip address. */
Damien Miller33804262001-02-04 23:20:18 +110077 return xstrdup(ntop);
Damien Millerd4a8b7e1999-10-27 13:42:43 +100078 }
Damien Millerd4a8b7e1999-10-27 13:42:43 +100079
Damien Miller3a961dc2003-06-03 10:25:48 +100080 /*
81 * if reverse lookup result looks like a numeric hostname,
82 * someone is trying to trick us by PTR record like following:
83 * 1.1.1.10.in-addr.arpa. IN PTR 2.3.4.5
84 */
85 memset(&hints, 0, sizeof(hints));
86 hints.ai_socktype = SOCK_DGRAM; /*dummy*/
Darren Tucker0f684862003-06-05 09:52:42 +100087 hints.ai_flags = AI_NUMERICHOST;
Damien Miller3a961dc2003-06-03 10:25:48 +100088 if (getaddrinfo(name, "0", &hints, &ai) == 0) {
89 logit("Nasty PTR record \"%s\" is set up for %s, ignoring",
90 name, ntop);
91 freeaddrinfo(ai);
92 return xstrdup(ntop);
93 }
94
Damien Miller5428f641999-11-25 11:54:57 +110095 /*
Damien Miller33804262001-02-04 23:20:18 +110096 * Convert it to all lowercase (which is expected by the rest
97 * of this software).
Damien Miller5428f641999-11-25 11:54:57 +110098 */
Damien Miller33804262001-02-04 23:20:18 +110099 for (i = 0; name[i]; i++)
100 if (isupper(name[i]))
Damien Miller1d2b6702006-03-26 14:09:54 +1100101 name[i] = (char)tolower(name[i]);
Damien Miller33804262001-02-04 23:20:18 +1100102 /*
103 * Map it back to an IP address and check that the given
104 * address actually is an address of this host. This is
105 * necessary because anyone with access to a name server can
106 * define arbitrary names for an IP address. Mapping from
107 * name to IP address can be trusted better (but can still be
108 * fooled if the intruder has access to the name server of
109 * the domain).
110 */
111 memset(&hints, 0, sizeof(hints));
112 hints.ai_family = from.ss_family;
113 hints.ai_socktype = SOCK_STREAM;
114 if (getaddrinfo(name, NULL, &hints, &aitop) != 0) {
Damien Miller996acd22003-04-09 20:59:48 +1000115 logit("reverse mapping checking getaddrinfo for %.700s "
Damien Millerde85a282006-03-15 12:06:41 +1100116 "[%s] failed - POSSIBLE BREAK-IN ATTEMPT!", name, ntop);
Damien Miller33804262001-02-04 23:20:18 +1100117 return xstrdup(ntop);
Damien Miller95def091999-11-25 00:26:21 +1100118 }
Damien Miller33804262001-02-04 23:20:18 +1100119 /* Look for the address from the list of addresses. */
120 for (ai = aitop; ai; ai = ai->ai_next) {
121 if (getnameinfo(ai->ai_addr, ai->ai_addrlen, ntop2,
122 sizeof(ntop2), NULL, 0, NI_NUMERICHOST) == 0 &&
123 (strcmp(ntop, ntop2) == 0))
124 break;
125 }
126 freeaddrinfo(aitop);
127 /* If we reached the end of the list, the address was not there. */
128 if (!ai) {
129 /* Address not found for the host name. */
Damien Miller996acd22003-04-09 20:59:48 +1000130 logit("Address %.100s maps to %.600s, but this does not "
Damien Miller5eb137c2005-12-31 16:19:53 +1100131 "map back to the address - POSSIBLE BREAK-IN ATTEMPT!",
Damien Miller33804262001-02-04 23:20:18 +1100132 ntop, name);
133 return xstrdup(ntop);
134 }
Damien Miller95def091999-11-25 00:26:21 +1100135 return xstrdup(name);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000136}
137
Damien Miller5428f641999-11-25 11:54:57 +1100138/*
Damien Miller33804262001-02-04 23:20:18 +1100139 * If IP options are supported, make sure there are none (log and
140 * disconnect them if any are found). Basically we are worried about
141 * source routing; it can be used to pretend you are somebody
142 * (ip-address) you are not. That itself may be "almost acceptable"
143 * under certain circumstances, but rhosts autentication is useless
144 * if source routing is accepted. Notice also that if we just dropped
145 * source routing here, the other side could use IP spoofing to do
146 * rest of the interaction and could still bypass security. So we
147 * exit here if we detect any IP options.
148 */
149/* IPv4 only */
Ben Lindstrombba81212001-06-25 05:01:22 +0000150static void
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000151check_ip_options(int sock, char *ipaddr)
Damien Miller33804262001-02-04 23:20:18 +1100152{
Darren Tucker89f4cf02003-08-07 13:29:04 +1000153#ifdef IP_OPTIONS
Ben Lindstrom075390a2001-02-10 21:34:46 +0000154 u_char options[200];
155 char text[sizeof(options) * 3 + 1];
Damien Miller33804262001-02-04 23:20:18 +1100156 socklen_t option_size;
Damien Millereccb9de2005-06-17 12:59:34 +1000157 u_int i;
158 int ipproto;
Damien Miller33804262001-02-04 23:20:18 +1100159 struct protoent *ip;
160
161 if ((ip = getprotobyname("ip")) != NULL)
162 ipproto = ip->p_proto;
163 else
164 ipproto = IPPROTO_IP;
165 option_size = sizeof(options);
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000166 if (getsockopt(sock, ipproto, IP_OPTIONS, options,
Damien Miller33804262001-02-04 23:20:18 +1100167 &option_size) >= 0 && option_size != 0) {
Ben Lindstrom075390a2001-02-10 21:34:46 +0000168 text[0] = '\0';
169 for (i = 0; i < option_size; i++)
170 snprintf(text + i*3, sizeof(text) - i*3,
171 " %2.2x", options[i]);
Damien Miller4d3fd542005-11-05 15:13:24 +1100172 fatal("Connection from %.100s with IP options:%.800s",
Damien Miller33804262001-02-04 23:20:18 +1100173 ipaddr, text);
174 }
Darren Tucker89f4cf02003-08-07 13:29:04 +1000175#endif /* IP_OPTIONS */
Damien Miller33804262001-02-04 23:20:18 +1100176}
177
Darren Tucker2fba9932005-02-02 23:30:24 +1100178void
Damien Miller927f5272003-11-24 12:57:25 +1100179ipv64_normalise_mapped(struct sockaddr_storage *addr, socklen_t *len)
180{
181 struct sockaddr_in6 *a6 = (struct sockaddr_in6 *)addr;
182 struct sockaddr_in *a4 = (struct sockaddr_in *)addr;
183 struct in_addr inaddr;
184 u_int16_t port;
185
Damien Miller94cf4c82005-07-17 17:04:47 +1000186 if (addr->ss_family != AF_INET6 ||
Damien Miller927f5272003-11-24 12:57:25 +1100187 !IN6_IS_ADDR_V4MAPPED(&a6->sin6_addr))
188 return;
189
190 debug3("Normalising mapped IPv4 in IPv6 address");
191
192 memcpy(&inaddr, ((char *)&a6->sin6_addr) + 12, sizeof(inaddr));
193 port = a6->sin6_port;
194
195 memset(addr, 0, sizeof(*a4));
196
197 a4->sin_family = AF_INET;
198 *len = sizeof(*a4);
199 memcpy(&a4->sin_addr, &inaddr, sizeof(inaddr));
200 a4->sin_port = port;
201}
202
Damien Miller33804262001-02-04 23:20:18 +1100203/*
Damien Miller5428f641999-11-25 11:54:57 +1100204 * Return the canonical name of the host in the other side of the current
205 * connection. The host name is cached, so it is efficient to call this
206 * several times.
207 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000208
Damien Miller95def091999-11-25 00:26:21 +1100209const char *
Damien Miller3a961dc2003-06-03 10:25:48 +1000210get_canonical_hostname(int use_dns)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000211{
Damien Miller24ecf612005-11-05 15:16:52 +1100212 char *host;
Damien Miller34132e52000-01-14 15:45:46 +1100213 static char *canonical_host_name = NULL;
Damien Miller24ecf612005-11-05 15:16:52 +1100214 static char *remote_ip = NULL;
Damien Miller34132e52000-01-14 15:45:46 +1100215
Damien Miller33804262001-02-04 23:20:18 +1100216 /* Check if we have previously retrieved name with same option. */
Damien Miller24ecf612005-11-05 15:16:52 +1100217 if (use_dns && canonical_host_name != NULL)
218 return canonical_host_name;
219 if (!use_dns && remote_ip != NULL)
220 return remote_ip;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000221
Damien Miller95def091999-11-25 00:26:21 +1100222 /* Get the real hostname if socket; otherwise return UNKNOWN. */
Damien Miller34132e52000-01-14 15:45:46 +1100223 if (packet_connection_is_on_socket())
Damien Miller24ecf612005-11-05 15:16:52 +1100224 host = get_remote_hostname(packet_get_connection_in(), use_dns);
Damien Miller95def091999-11-25 00:26:21 +1100225 else
Damien Miller24ecf612005-11-05 15:16:52 +1100226 host = "UNKNOWN";
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000227
Damien Miller24ecf612005-11-05 15:16:52 +1100228 if (use_dns)
229 canonical_host_name = host;
230 else
231 remote_ip = host;
232 return host;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000233}
234
Damien Miller5428f641999-11-25 11:54:57 +1100235/*
Ben Lindstromacaac972002-12-23 02:13:37 +0000236 * Returns the local/remote IP-address/hostname of socket as a string.
237 * The returned string must be freed.
Damien Millerd83ff352001-01-30 09:19:34 +1100238 */
Ben Lindstrombba81212001-06-25 05:01:22 +0000239static char *
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000240get_socket_address(int sock, int remote, int flags)
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000241{
242 struct sockaddr_storage addr;
243 socklen_t addrlen;
244 char ntop[NI_MAXHOST];
Damien Miller9b8073e2005-03-01 21:16:18 +1100245 int r;
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000246
247 /* Get IP address of client. */
248 addrlen = sizeof(addr);
249 memset(&addr, 0, sizeof(addr));
250
251 if (remote) {
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000252 if (getpeername(sock, (struct sockaddr *)&addr, &addrlen)
Damien Millerb2f844d2002-09-25 12:19:08 +1000253 < 0)
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000254 return NULL;
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000255 } else {
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000256 if (getsockname(sock, (struct sockaddr *)&addr, &addrlen)
Damien Millerb2f844d2002-09-25 12:19:08 +1000257 < 0)
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000258 return NULL;
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000259 }
Damien Miller5e4471e2003-01-07 10:51:23 +1100260
261 /* Work around Linux IPv6 weirdness */
262 if (addr.ss_family == AF_INET6)
263 addrlen = sizeof(struct sockaddr_in6);
264
Darren Tucker5b115d42005-05-03 19:05:32 +1000265 ipv64_normalise_mapped(&addr, &addrlen);
266
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000267 /* Get the address in ascii. */
Damien Miller9b8073e2005-03-01 21:16:18 +1100268 if ((r = getnameinfo((struct sockaddr *)&addr, addrlen, ntop,
269 sizeof(ntop), NULL, 0, flags)) != 0) {
270 error("get_socket_address: getnameinfo %d failed: %s", flags,
271 r == EAI_SYSTEM ? strerror(errno) : gai_strerror(r));
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000272 return NULL;
273 }
274 return xstrdup(ntop);
275}
Damien Millerd83ff352001-01-30 09:19:34 +1100276
277char *
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000278get_peer_ipaddr(int sock)
Damien Millerd83ff352001-01-30 09:19:34 +1100279{
Damien Millerb2f844d2002-09-25 12:19:08 +1000280 char *p;
281
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000282 if ((p = get_socket_address(sock, 1, NI_NUMERICHOST)) != NULL)
Damien Millerb2f844d2002-09-25 12:19:08 +1000283 return p;
284 return xstrdup("UNKNOWN");
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000285}
Damien Millerd83ff352001-01-30 09:19:34 +1100286
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000287char *
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000288get_local_ipaddr(int sock)
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000289{
Damien Millerb2f844d2002-09-25 12:19:08 +1000290 char *p;
291
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000292 if ((p = get_socket_address(sock, 0, NI_NUMERICHOST)) != NULL)
Damien Millerb2f844d2002-09-25 12:19:08 +1000293 return p;
294 return xstrdup("UNKNOWN");
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000295}
296
297char *
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000298get_local_name(int sock)
Ben Lindstrom5eabda32001-04-12 23:34:34 +0000299{
Darren Tucker3f9fdc72004-06-22 12:56:01 +1000300 return get_socket_address(sock, 0, NI_NAMEREQD);
Damien Millerd83ff352001-01-30 09:19:34 +1100301}
302
303/*
Damien Miller5428f641999-11-25 11:54:57 +1100304 * Returns the IP-address of the remote host as a string. The returned
Damien Miller34132e52000-01-14 15:45:46 +1100305 * string must not be freed.
Damien Miller5428f641999-11-25 11:54:57 +1100306 */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000307
Damien Miller95def091999-11-25 00:26:21 +1100308const char *
Ben Lindstrom3c36bb22001-12-06 17:55:26 +0000309get_remote_ipaddr(void)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000310{
Damien Miller34132e52000-01-14 15:45:46 +1100311 static char *canonical_host_ip = NULL;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000312
Damien Millerd83ff352001-01-30 09:19:34 +1100313 /* Check whether we have cached the ipaddr. */
314 if (canonical_host_ip == NULL) {
315 if (packet_connection_is_on_socket()) {
316 canonical_host_ip =
317 get_peer_ipaddr(packet_get_connection_in());
318 if (canonical_host_ip == NULL)
Darren Tucker3e33cec2003-10-02 16:12:36 +1000319 cleanup_exit(255);
Damien Millerd83ff352001-01-30 09:19:34 +1100320 } else {
321 /* If not on socket, return UNKNOWN. */
322 canonical_host_ip = xstrdup("UNKNOWN");
323 }
Damien Miller95def091999-11-25 00:26:21 +1100324 }
Damien Miller95def091999-11-25 00:26:21 +1100325 return canonical_host_ip;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000326}
327
Ben Lindstromf15a3862001-04-05 23:32:17 +0000328const char *
Damien Miller3a961dc2003-06-03 10:25:48 +1000329get_remote_name_or_ip(u_int utmp_len, int use_dns)
Ben Lindstromf15a3862001-04-05 23:32:17 +0000330{
331 static const char *remote = "";
332 if (utmp_len > 0)
Damien Miller3a961dc2003-06-03 10:25:48 +1000333 remote = get_canonical_hostname(use_dns);
Ben Lindstromf15a3862001-04-05 23:32:17 +0000334 if (utmp_len == 0 || strlen(remote) > utmp_len)
335 remote = get_remote_ipaddr();
336 return remote;
337}
338
Damien Miller34132e52000-01-14 15:45:46 +1100339/* Returns the local/remote port for the socket. */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000340
Ben Lindstrombba81212001-06-25 05:01:22 +0000341static int
Damien Miller34132e52000-01-14 15:45:46 +1100342get_sock_port(int sock, int local)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000343{
Damien Miller34132e52000-01-14 15:45:46 +1100344 struct sockaddr_storage from;
345 socklen_t fromlen;
346 char strport[NI_MAXSERV];
Damien Miller9b8073e2005-03-01 21:16:18 +1100347 int r;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000348
Damien Miller95def091999-11-25 00:26:21 +1100349 /* Get IP address of client. */
350 fromlen = sizeof(from);
351 memset(&from, 0, sizeof(from));
Damien Miller34132e52000-01-14 15:45:46 +1100352 if (local) {
353 if (getsockname(sock, (struct sockaddr *)&from, &fromlen) < 0) {
354 error("getsockname failed: %.100s", strerror(errno));
355 return 0;
356 }
357 } else {
Ben Lindstromacaac972002-12-23 02:13:37 +0000358 if (getpeername(sock, (struct sockaddr *)&from, &fromlen) < 0) {
Damien Miller34132e52000-01-14 15:45:46 +1100359 debug("getpeername failed: %.100s", strerror(errno));
Damien Miller677257f2005-06-17 12:55:03 +1000360 return -1;
Damien Miller34132e52000-01-14 15:45:46 +1100361 }
Damien Miller95def091999-11-25 00:26:21 +1100362 }
Damien Miller5e4471e2003-01-07 10:51:23 +1100363
364 /* Work around Linux IPv6 weirdness */
365 if (from.ss_family == AF_INET6)
366 fromlen = sizeof(struct sockaddr_in6);
367
Damien Miller95def091999-11-25 00:26:21 +1100368 /* Return port number. */
Damien Miller9b8073e2005-03-01 21:16:18 +1100369 if ((r = getnameinfo((struct sockaddr *)&from, fromlen, NULL, 0,
370 strport, sizeof(strport), NI_NUMERICSERV)) != 0)
371 fatal("get_sock_port: getnameinfo NI_NUMERICSERV failed: %s",
372 r == EAI_SYSTEM ? strerror(errno) : gai_strerror(r));
Damien Miller34132e52000-01-14 15:45:46 +1100373 return atoi(strport);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000374}
375
Damien Miller34132e52000-01-14 15:45:46 +1100376/* Returns remote/local port number for the current connection. */
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000377
Ben Lindstrombba81212001-06-25 05:01:22 +0000378static int
Damien Miller34132e52000-01-14 15:45:46 +1100379get_port(int local)
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000380{
Damien Miller5428f641999-11-25 11:54:57 +1100381 /*
382 * If the connection is not a socket, return 65535. This is
383 * intentionally chosen to be an unprivileged port number.
384 */
Damien Miller34132e52000-01-14 15:45:46 +1100385 if (!packet_connection_is_on_socket())
Damien Miller95def091999-11-25 00:26:21 +1100386 return 65535;
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000387
Damien Miller34132e52000-01-14 15:45:46 +1100388 /* Get socket and return the port number. */
389 return get_sock_port(packet_get_connection_in(), local);
390}
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000391
Damien Miller4af51302000-04-16 11:18:38 +1000392int
Damien Miller34132e52000-01-14 15:45:46 +1100393get_peer_port(int sock)
394{
395 return get_sock_port(sock, 0);
396}
397
Damien Miller4af51302000-04-16 11:18:38 +1000398int
Ben Lindstrom3c36bb22001-12-06 17:55:26 +0000399get_remote_port(void)
Damien Miller34132e52000-01-14 15:45:46 +1100400{
Damien Miller0670c732004-07-21 21:53:34 +1000401 static int port = -1;
402
403 /* Cache to avoid getpeername() on a dead connection */
404 if (port == -1)
405 port = get_port(0);
406
407 return port;
Damien Miller34132e52000-01-14 15:45:46 +1100408}
409
410int
Ben Lindstrom3c36bb22001-12-06 17:55:26 +0000411get_local_port(void)
Damien Miller34132e52000-01-14 15:45:46 +1100412{
413 return get_port(1);
Damien Millerd4a8b7e1999-10-27 13:42:43 +1000414}